This is part number 202 475 67 26 which replaces part 123 476 30 76, the 60 MM fuel line that runs from the brass elbow fitting to the first fuel pump, on a 1989 420 SEL. It probably is the same for all of the W126 class cars, 1986-91 with dual fuel pumps.
I had to buy a meter of the hose at the dealer, but I only used 60 MM, so many more pieces can be cut. This is the real MB hose, not a substitute. This is brand new, purchased Oct. 29, 2004. I will sell a 60MM piece for US$7 plus shipping. Part is located in Toronto Canada.